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    java.lang.NullPointerException
        at org.apache.felix.scrplugin.helper.Validator.validateMethod(Validator.java:523)
        at org.apache.felix.scrplugin.helper.Validator.validateReference(Validator.java:465)
        at org.apache.felix.scrplugin.helper.Validator.validate(Validator.java:189)
        at org.apache.felix.scrplugin.SCRDescriptorGenerator.execute(SCRDescriptorGenerator.java:214)
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